Manufacture of spring packing-rings for pistons and the like.



APPLICATION HLED NOV-22. I9]?- Patented Mar. 4, 1919.

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0 d I E a V INVEN7'0R GEORGE. Waadv/m:

l G. woonvms. MANUFACTURE OF SPRING PACKING RINGS FOR PISTONS AND THELIKE.

APPLICATION FILED NOV. 22, I91].

1,296,580. Patented Mar. 4,1919.

F, a s 3 $NEETSHEET 2.

INVEA/TOIT GIL-0R6 6 W000 VINE 1'7 TTORIVEl J G. WOODVINE. MANUFACTUREOF SPRlNG PACKING MNGS FOR PISTONS AND THE LIKE.

APPLICATION FILED NOV. 22, 917. 1 ,296,580. Patented Mar. 4,1919.

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MANUFACTURE 01" SPRING PACKING-RINGS 1'03 PISTON! AND THE mm.

, Specification of Letter: Patent.

Patented Mar. 4, 1919.

Application fled November 28. 1817. till lie. $08.44!.

To all whom it may cmwem:

Be it known that I, GEORGE Wooovmn, a subject of the King of GreatBritain and Ireland, and a resident of Shrewsbury, in the county ofSalop, England, have invented certain new and useful Improvements in theManufacture of S ring Packing-Rings for Pistons and the li e, and ofwhich the followin is the specification.

' This invention relates to divided sprin acking I'll)? has for its 0ject to impart to such rings in an improved manner the necessary springto cause them when in position on the piston, to bear with the requireduniform pressure a inst the inner wall of the cylinder in w 'ch thepiston works.

Hitherto to attain this object such rings have been subjected to unequalcompression by hammering or rolling, the compression and graduallydimims \ing toward these ends and being applied either to the internalor the external surface of the ring according to whether it is desiredto expand or contract the. ring.

According to the present invention the is turned and bored concentricand also l'lIl split as usual, and where it is desired to exand the ringit is then laid in a holder or is and the inner periphery subjected topressure by pushing through the ring a roach or mandrel having on itsperiphery a series of pro'ections arranged eccentric to the body of t emandrel in such manner that the maximum projection bears on the innersurface of the ring at the point opposite to the cut ends thereof, theprojections adually diminishing from this oint in gdth directions untilthey finally disappear at points a little distance away from the part ofthe mandrel adjacent to the cut ends of the ring, the mandrel bearing onthe ring at this part. Thus on pushing the mandrel throu h the ring themetal on the inner surface t ereof is indented and stretched by theprojections in a gradually diminishing degree in both directions fromthe point opposite to the cut ends and the desired spring is thusimparted to the ring.

Where it is desired to contract the rin it is placed around a solidholder or die, an a hollow broach with the eccentrically placedrejections on its inner periphery is need.

us on pushing the broach over the for pistons and the like; an

osite to the the rejections are made to bear on the outer Eur ace of thering instead of the inner surace.

The broach or mandrel may be constructed in various ways. For examplethe projections thereon may take the form of a number of steel ballsheld in a groove. which is eccentric to the body of the mandrel. Or therojections maybe in the form of teeth gra ually diminishing in effectiveradial depth from the maximum actin on the inner surface of the ring atthe point opposite to the cut ends thereof, and held in recesses in theperipher of. the mandrel. That is to say1 the test may be of graduallydiminis ing depth and the recesses uniform in sizes, or again the teethmay be of uniform de th and the recesses of varying depths.

hree sheets of explanatory drawings are hereunto a pended in whichFigure 1 is a plan and ig'. 2 a vertical section showing an exam le ofthe improved means used to expand t e packing rings, a second example isshown to a larger scale in plan in Fig. 3; while Fig. 4 is a verticalsection and Fig. 5 an inverted plan showin an exam le of the improvedmeans used w ere it is esired to contract the packing rings.

As shown in Fi 1 and 2 there is provided a hollow hol er or die A havingan internal stepped portion of such depth that a number of packing ringsB may be laid therein, one above the other, the rings having been, ofcourse, first turned and bored concentric and also split as usual. Theradial depth of the stepped portion of the holder'A relative to thethickness of the rings B is such that, as shown, the internal diameterof the rings, when the are in position in the holder, is slightly essthan the internal diameter of the lower portion of the holder. The ringsB are held ivnvplace in the holder by a cover plate 0. 1th this holder Athere coacts a breach or mandrel made in two portions D, E held to otherby studs G. The meeting edges of t ese two portions are so shaped as toform a groove H eccentric to the body of the breach in which groove areballs J which form a ring of pro ections also eccentric to the peripheryof the breach. To expand the rings B, the breach D, E is so forcedthrough the holder A that the maximum projection J bears on the innersurface of the rings in the holder, at the point opposite to the cutends of the rings,

the projections goadually diminishi from this point in th directionsunti they finally disappear at points a little distance awa from t epart of the broach adjacent to t e cut ends of the ring at which partthe periphery of the mandrel bears on the inner surface of the rings.The metal on the inner surface of the rings is indented and stretched bythe projections J in a gradually diminishing degree in both directionsfrom the oint opposite to the cut ends, and the desires spring is thusimparted to the rings. f

The example shown in Fig. 3 difl'ers from that hereinbefore describedonly in that the projections J are in the form of teeth graduallydiminishing in effective radial de th from the maximum acting, ashereinbe ore described, on the inner surface of the rings B,'in theholder A, at the point opposite to the cut ends thereof, and held inrecesses K in the ripher of the breach. As s wn in i igs. 4 and 5-, whenthe rings B are to becontracted they are placed around a solid holder Land held in place by a cover plate C and a hollow 'broach D,.E, withtheeccentricall placed ball pro'ections J on; its inner peri ery, is used.T us on pushing the broac over the rings the pro ections bear on theouter surface of the rings instead of the inner surface, the broachbeing so placed relative to the rings that the maximumprojection bearson each ring at the point op osite to thecut 'ends thereof.

What claim is 1. In 1:35 manufactiire of cut or split 5 rin 'n rin orpistons and t e 15m, E h dlder rece iire the rings and a tool comprisinga body portion carrying rojections arranged eccentric to the body tereof in such manner that when applied to the rings the maximumprojection ears on each ring at the point opposite to the cut endsthereof, the rojections gradually diminishing from the point in bothdirections until theyfinally disappear at points a little distance awayfrom the part of the tool adjacent to and adapted to bear upon the cutends of the rings, as described.

2. In the manufacture of cut or split spring packing rings for pistonsand the nuance like, a holder to carry the rings, a tool comprising abody portion, lprojections thereon in the form of steel he] s held in agroove eccentric to the body of the tool, the tool being so applied tothe rings that the maximum, projection bears on each ring at the pointopposite to the cut ends thereof, the pro ections adually diminishinfrom this omt m b0 h directions until t ey finally reappear at points alittle distance away from the part of the tool adjacent to and adaptedto bear upon the cut ends of the rings as described.

8 in the manufacture of cut or split Baring packing rings for pistons.and the l1 e, a hollow older in Wl'llCl'l the rings are laid, a toolcomprising a body portion, projectlons arranged eccentrically on theouter periphery thereof, the tool being so forced through the rings thatthe maximum projection bears on the inner surface of each ring at thepoint opposite to the out ends thereof, the projections raduallydiminishing from thls point in bot directions until they finallydisappear at points a little distance away from the part of the tooladjacent to and adapted to bear upon the cut ends of the rings asdescribed.

4. in the manufacture of cut or split s iring packing rings for pistonsand the 11 e, a hollow holder in whichthe rings are laid, a toolcomprising a body ortion projectlons on the outer riphery t ereof 1n theform of steel balls he d in a oove eccentric to the body of the broach,t e broach being so forced through the rings that the maximum rojectionbears on the inner surface of sec ring at the point opposite to the cutends thereof, the projections gradually diminishing from this point inboth directions until they finally disappear at oints a little distanceawa from the part 0 the tool adjacent to an adapted to bear upon the cutends of the rings, as described.

In testimony whereof I have signed my name to this specification, in thepresence of two subscribing witnesses.

GEORGE W'OODVINE.

Witnesses:

ANDREW Soonnm, B. K. Hoos'ron.

